dc.contributor.author | Løkkeborg, Svein | |
dc.contributor.author | Soldal, Aud Vold | |
dc.date.accessioned | 2012-09-14T18:31:11Z | |
dc.date.available | 2012-09-14T18:31:11Z | |
dc.date.issued | 1995 | |
dc.identifier.citation | This report is not to be cited without prior reference to the authors | no_NO |
dc.identifier.uri | http://hdl.handle.net/11250/105419 | |
dc.description.abstract | Studies of the vulnerability to gear damage of fish that have been caught in a trawl but have
escaped through the codend meshes have focussed on determining survival rates. This study
examines the risk of predation in small cod (Gadus morhua) (18.2 cm mean total length)
escaping a small-scale trawl. Trawling was simulated in a circular tank by towing a small
mock-up of a trawl (70 mm codend meshes) for 30 minutes. Escaped fish were retained in
a small-meshed net (16 mm) covering the codend. After each towing period, three or four of
these fish and the same number of fish from a control group were immediately transferred to
a tank holding five large. cod (56.3 cm mean total length). Predation by the large cod was
recorded for 30 min or until 50% of the small cod had been taken. In a total of nine
experiments, equal numbers of escaping fish and fish from the control group were eaten by
the large cod. This indicates that small cod escaping from a trawl do not have increased risk
of predation under these experimental conditions. However, the stressed fish were not
physically exhausted and the predation experiment was conducted under conditions where the
predator could easily capture both stressed and control fish. | no_NO |
dc.language.iso | eng | no_NO |
dc.publisher | ICES | no_NO |
dc.relation.ispartofseries | ICES CM Documents;1995/B:15 | |
dc.subject | cod | no_NO |
dc.subject | torsk | no_NO |
dc.subject | trawl | no_NO |
dc.subject | trål | no_NO |
dc.subject | gear experiments | no_NO |
dc.subject | redskapsforsøk | no_NO |
dc.title | Vulnerability to predation of small cod (Gadus morhua) that escape from a trawl | no_NO |
dc.type | Working paper | no_NO |
dc.subject.nsi | VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ethology: 485 | no_NO |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fisheries technology: 924 | no_NO |
dc.source.pagenumber | 7 s. | no_NO |